A 1975 CIA memo says a thorough search of agency records in and outside the United States was conducted to determine whether Oswald had been used by the agency or connected with it in "any conceivable way." The memo said the search came up empty.

by Dale K. Myers

The latest numbers from Gallup, from a 2013 survey taken to mark the 50th anniversary of the event, showed 61% of Americans believed the assassination was a conspiracy, while 30% believed Oswald acted alone.